High-frequency induction apparatus.



No. 779,673. PATENTED JAN. 10, 1905. G. L. SPAULDING o; R. E. AUSTIN.

HIGH FREQUENCY INDUCTION APPARATUS.

APPLICATION FILED APR. 25, 1904.

UNITED STATES Patented January 10, 1905.

PATENT OFFICE,

CHARLES L. SPAULDING AND ROBERT E. AUSTIN, OF KANSAS CITY,

MISSOURI, ASSIGNORS OF ONE-THIRD TO IVILLIAM R. CLARKE,

OF KANSAS CITY, MISSOURI.

HIGH-FREQUENCY INDUCTION APPARATUS.

SPECIFICATION forming part of Letters Patent No. 779,673, dated January10, 1905.

Application filed April 25, 1904. Serial No. 204,876.

T0 at whom, it may concern.-

Be it known that we, CHARLES L. SPAULDING and ROBERT EMMETT AUSTIN, ofKansas City, Missouri, have invented a new and useful High-FrequencyInduction Apparatus, which invention is fully set forth in the followingspecification.

This invention relates to high-frequency induction apparatus, and moreespecially to induction-coils, and has for its principal objects theprevention of leakage between the different coils, diminution of theinterposed insulation, and obtainment of a greater amount of energy fromthe primaries.

The apparatus consists in its essential features of a plurality ofprimary and secondary coils and a condenser in circuit with the primarycoils. The latter are preferably connected with the secondarycoils forthe purposes hereinafter set forth.

Certain mechanical expressions of .the inventive idea are shown in theaccompanying drawings, which are designed merely as illustrations toassistin the description of the invention and not as defining the limitsthereof.

Figure 1 is an elevation, partly in section, showing the generalarrangements of the parts. Fig. 2 is a diagrammatic plan view showingthe circuit connections. Fig. 3 is a detached detail view of amodification.

1 1' designate two secondary coils wound in a single layer on suitablesupports or cylinders. Primary coils 2 2 are located near the lower endsof the induction-coils and connected therewith at 3 3 and with eachother by the metallic connection 4. In circuit with the primary coils isa condenser 5 of suitable capacity, which has its connections at 6 6with the primary coils. Between the condenser and one of the primariesis a spark-gap 7 and connected with the condenser is an inductioncoil ortransformer 8. At the upper ends of the secondaries are providedsuitable sparking rods 9 9, and the several coils, with the condenser,are provided with a case 10, which may be filled with any suitableinsulating material 11.

The operation of the apparatus as thus described is as follows: Theinduction-coil or transformer 8 charges the condenser 4, and saidcondenser discharges through the primaries 2 2' and across the spark-gap7, thus completing the primary circuit of the apparatus. This primarycircuit, which is of an oscillating or alternating character, inducescurrents in the secondaries 1 l, which are oppositely or otherwise sowound that when the lowermost turn of one is positive the lowermost turnof the other is negative. Consequently the lowermost turns whenconnected together have a potential practically nil and the potentialsrise from below upward, so that at the points marked 3'3 there is atendency of the secondaries to spark into the primaries. Such tendencyis overcome by connecting the lowermost turn of each secondary to theinnermost turn of its corresponding primary at 3 3. Thus theconnecting-wire at becomes the common carrier both of the primarycurrents from the condenser and of the currents generated in thesecondaries 1 1. The tendency to spark between primaries and secondariesbeing very greatly reduced, the primaries can be placed very close tothe bases of the secondaries, thus greatly increasing the inductiveinfluence. The potential in the secondaries rises as they ascend untilit is at a maximum at their tops, where they are connected to thesparking rods 9 9.

The primaries are preferably made of a few turns of coarse copper ribbonor wire in the form of an annulus, as illustrated, though they may takein other forms, such as that of a helix, where each succeeding turn issuperimposed on the preceding turn. The form or shape of the primariesmay be varied and may be square or round, as is best suited to theparticular type of apparatus desired. The primaries are illustrated aslocated in the same plane with the condenser and are connected in seriesacross an interposed sparkgap. Other arrangements may, however, be madewithout departing from the principle of the invention, such asconnecting the primaries in multiple and placing the condenser in otherpositions than between them.

The secondaries preferably consist of a single layer of wire wound ontwo cylinders and are of such dimensions 'as are best suited to the typeof apparatus to be constructed. The form of these cylinders may beround, square, or elliptical. Each primary is placed below or outside ofand below its corresponding cylindrical secondary and preferably as nearthe base of said secondary as possible, although the primaries need notnecessarily be at the bases of their corresponding secondaries, but maybe nearer the middle of said secondaries. The windings of thesecondaries may terminate above those of the primaries, as shown in Fig.3. In this type of apparatus the lowermost turns of the secondary may beconnected together by a separate wire and need not be joined to theprimaries, though where the primaries are placed very close to thesecondaries we prefer to make the connections as illustrated in Fig. 2.In making these connections thelowest turn of the secondary ispreferably connected to the innermost turns of the primary.

The character of the discharge between the terminals 9 9 may be adaptedto the particular use desired by properly varying the capacity of thecondenser and the inductance of the primary coils.

In the preferred form of the apparatus herein illustrated the primarycoils are flat and the secondaries are cylindrical, being several timesthe length of the former and ex- .tending upward through the cover ofthe case above the flat primaries. The coils may, however, be made totake on other forms and the parts may vary in size and relativeproportion without departing from the spirit of the invention.

What is claimed is 1. In an induction apparatus, a plurality ofprimaries, a condenser in the circuit with the primaries, andsecondaries associated with and connected to the primaries respectively.

2. In an induction apparatus, a plurality of fiat coil primaries, acondenser and spark-gap in the circuit joining their terminals, andsecondaries associated with and connected to each of the primaries.

3. In an induction apparatus, a plurality of primaries in series, acondenser in the circuit, and secondaries associated with and connectedto each of the primaries.

4. In an induction apparatus, a plurality of primaries, a condenser inthe circuit joining their terminals, and secondaries associated with andconnected to each of the iirimaries.

5. In an induction apparatus, a plurality of primaries, a condenser andspark-gap in the circuit joining their terminals, and secondariesassociated with and connected to each of the primaries.

6. In an induction apparatus comprising two primaries and twosecondaries, a condenser located in the circuit of the primaries, aspark-gap between the condenser and one of the primaries, connectionsbetween the primaries and the ends of the secondaries, and sparkingterminals attached to the other ends of the secondaries.

7. In an induction apparatus, two primary coils in series and twosecondary coils, each primary coil surrounding the end of itscorresponding secondary coil and having its inner turn connected to oneend of the said secondary, a condenser in the circuit of the primarycoils and connected to the outer turns of the same, a spark-gap betweenthe condenser and one of said primary coils, and sparking rods for theterminals of the secondary coils.

8. An induction apparatus, comprisingtwo primary coils in series and twosecondary coils, each primary coil surrounding the end of itscorresponding secondary coil and having its inner turn connected to oneend of said secondary coil, a condenser in the circuit of the primarycoils and connected to the outer turns of the same, a spark-gap betweenthe condenser and one of said primary coils, sparking rods for theterminals of the secondary coils, and a box surrounding the pri mariesand condenser and provided with apertures through which the secondariesprotrude.

E). In an induction apparatus, a plurality of flat coiled primaries andcylindrical secondaries, said primaries being located at the.extremities of said secondaries.

In testimony whereof we have signed this specification in the presenceof two subscribing witnesses.

CHARLES L. SPAULDING. R. E. AUSTIN.

WVitnesses:

WM. R. CLARKE, EDWARD ABnLns.

